Environmental Studies Program, Adelphi University, Garden City, NY, 11530, USA.
Department of Biology, Texas State University, Aquatic Station, San Marcos, TX, 78666, USA.
Bull Environ Contam Toxicol. 2019 Sep;103(3):380-384. doi: 10.1007/s00128-019-02667-1. Epub 2019 Jun 24.
This study compared the concentration of essential (Co, Cr, Cu, Fe, Mn, Ni, Se, Zn) and nonessential (Ag, As, Cd, Hg, Pb) trace elements in the muscle tissue of a pregnant common thresher shark (Alopias vulpinus) to the concentration in the three embryos. With the exception of Ag, Cd, Cr, and Ni which were below the detection limit, all other elements accumulated in the embryo muscle tissue. The Se:Hg molar ratios in the embryos averaged 9.8, indicating that Se may have a protective role against Hg toxicity during this early life stage. Maternal transfer as a source of trace elements in sharks should not be overlooked and future studies need to focus on how reproductive strategy influences this process.
本研究比较了怀孕普通长尾鲨（Alopias vulpinus）肌肉组织中必需（Co、Cr、Cu、Fe、Mn、Ni、Se、Zn）和非必需（Ag、As、Cd、Hg、Pb）微量元素的浓度与三个胚胎中的浓度。除了 Ag、Cd、Cr 和 Ni 低于检测限外，所有其他元素都在胚胎肌肉组织中积累。胚胎中 Se:Hg 摩尔比平均为 9.8，表明在这个早期生命阶段，Se 可能具有保护作用，可抵御 Hg 的毒性。作为鲨鱼微量元素来源的母体转移不应被忽视，未来的研究需要集中研究生殖策略如何影响这一过程。
